Wind turbine main shaft bearing circulating oil lubrication system

Abstract

The present invention provides a circulating oil lubrication system for the main shaft bearing of a wind turbine generator set, comprising: a bearing seat for supporting the main bearing; a main bearing for supporting the rotation of the main shaft of the wind turbine generator; an oil storage tank for keeping the roller of the main bearing in an oil bath state; a sealing structure, the sealing structure comprising a sealing ring, a large cover plate and a middle cover plate, an O-ring is arranged on the contact surface between the large cover plate and the bearing seat, a radial sealing ring is arranged between the large cover plate and the sealing ring, and a felt sealing ring is arranged between the middle cover plate and the sealing ring; an oil injection hole, the oil injection hole is arranged on the large cover plate and communicated with the oil storage tank; an oil storage cavity, the oil storage cavity is arranged in a cavity between two main bearings on the bearing seat. Compared with traditional grease lubrication, the main shaft bearing lubrication method using oil bath lubrication as the main and circulating oil injection lubrication as the auxiliary has a better lubrication effect on the main shaft bearing, can improve the lubrication conditions of the main shaft bearing, and better ensure the reliability of the main shaft bearing.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a circulating oil lubrication system for a main shaft bearing of a wind power generator set. Background Art

[0002] With the parity of wind power market, higher requirements are put forward for the reliability and operation and maintenance convenience of wind turbines. The main shaft bearing is one of the most important parts of the transmission system. The stability of its operating state is directly related to the unit, and whether the lubrication condition of the main shaft bearing is good directly determines the reliability and life of the bearing.

[0003] Traditional main shaft bearings rely mainly on grease lubrication. Since grease has strong adhesion, it can automatically flow away without being affected by gravity and fill the entire bearing seat, playing a lubricating role by wrapping the bearing rollers. However, due to the poor fluidity of grease and the characteristics of oil separation, in actual use, grease is prone to deposits in some dead corners of the bearing seat, and oil hardening occurs. The hardened grease further blocks the flow channel, causing the bearing to be unable to drain grease normally. The continuous accumulation of waste grease prevents new grease from reaching the parts that need lubrication, causing bearing wear and overheating. Therefore, it is particularly important to find a lubrication system that can effectively lubricate while avoiding problems such as grease hardening and compaction for the normal operation of wind turbine main shaft bearings. Summary of the invention

[0004] In view of this, the problem to be solved by the present invention is to provide a circulating oil lubrication system for the main shaft bearing of a wind turbine generator set, which adopts a main shaft bearing lubrication method with oil bath lubrication as the main method and circulating oil spray lubrication as the auxiliary method. Compared with traditional grease lubrication, the lubrication effect on the main shaft bearing is better, the lubrication conditions of the main shaft bearing can be improved, and the reliability of the main shaft bearing can be better guaranteed.

[0005] The present invention solves the above technical problems by the following technical means: The present invention provides a circulating oil lubrication system for a main shaft bearing of a wind turbine generator set, comprising:

[0006] A bearing seat, used to support the main bearing;

[0007] A main bearing is used to support the rotation of the main shaft of the wind turbine. The main bearing is installed on the bearing seat. Two main bearings are provided.

[0008] An oil storage tank, which is arranged in the mounting cavity of the main bearing on the bearing seat and is used to keep the rollers of the main bearing in an oil bath state;

[0009] A sealing structure, the sealing structure comprising a sealing ring, a large cover plate and a middle cover plate, the sealing ring is sleeved on the main shaft, one end face of the sealing ring abuts against the end face of the main bearing, the large cover plate is sleeved on the outer circumferential surface of the sealing ring, one end face of the large cover plate abuts against the bearing seat, the middle cover plate is sleeved on the outer circumferential surface of the sealing ring, one end face of the middle end cover abuts against the end face of the large end cover away from the main bearing, an O-ring is arranged on the contact surface between the large cover plate and the bearing seat, a radial sealing ring is arranged between the large cover plate and the sealing ring, and a felt sealing ring is arranged between the middle cover plate and the sealing ring;

[0010] An oil spray hole, the oil spray hole is arranged on the large cover plate and communicates with the oil storage tank, and a plurality of the oil spray holes are provided;

[0011] An oil storage chamber is provided in a cavity between two main bearings on the bearing seat, the oil storage tanks of the two main bearings are connected through the oil storage chamber, an oil return hole is provided at the lowest point of the cavity of the oil storage chamber, the oil return hole is connected to a circulating oil pump through an oil pipeline, and the circulating oil pump is connected to an oil injection hole through an oil pipeline.

[0012] Furthermore, the height of the rear shoulder of the bearing seat is higher than 1 / 2 of the roller of the main bearing and lower than the highest point of the roller.

[0013] Furthermore, the horizontal line at the highest point of the rear shoulder of the bearing seat forms the oil level line of the oil storage tank, the horizontal line at the lowest point of the sealing position of the radial sealing ring forms the radial sealing line, and the height of the oil level line is lower than the radial sealing line.

[0014] Furthermore, the fuel injection holes are arranged in the upper half circle of the large cover plate, and the number of the fuel injection holes located in the first quadrant of the upper half circle of the large cover plate is greater than the number of the fuel injection holes located in the second quadrant of the upper half circle of the large cover plate.

[0015] Furthermore, an oil drain hole is provided at the bottom of the oil storage tank, and a threaded plug or an electromagnetic valve for sealing the oil drain hole is detachably mounted on the oil drain hole.

[0016] Furthermore, a filter is provided between the oil return hole and the circulating oil pump.

[0017] Furthermore, the oil storage chamber is provided with a sensor and a temperature regulating device for detecting the temperature and pressure in the oil storage chamber, and also includes a controller, which is connected to the sensor, the temperature regulating device and the circulating oil pump signal. The controller is used to receive the output temperature and pressure signal of the sensor and issue instructions to control the temperature regulating device and the circulating oil pump according to the temperature and pressure signal.

[0018] Furthermore, a three-way valve is provided on the oil pipe between the circulating oil pump and the oil return hole, and the two inlets of the three-way valve are respectively connected to the oil return hole and the lubricating oil tank for storing lubricating oil, and the outlet is connected to the oil injection hole, and a valve is provided on the inlet of the three-way valve.

[0019] Furthermore, it also includes an oil filling pump, the inlet of which is connected to a lubricating oil tank for storing lubricating oil, the outlet of which is connected to an oil injection hole, and valves are respectively provided between the oil filling pump and the oil injection hole and between the circulating oil pump and the oil injection hole.

[0020] It can be seen from the above technical solution that the beneficial effects of the present invention are as follows: the present invention provides a circulating oil lubrication system for the main shaft bearing of a wind turbine generator set, which makes the lubrication condition of the main shaft bearing better, increases the stability of the main shaft bearing, and improves the reliability of the unit;

[0021] By providing an oil storage tank and an oil storage cavity, the oil storage tank ensures that the oil level of the front and rear bearings meets the oil bath lubrication and the seal is not submerged by the lubricating oil, and the oil storage cavity ensures that the stored oil meets the use requirements of the circulation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0023] Figure 1 is a cross-sectional view of the present invention;

[0024] Figure 2 for Figure 1 A partial enlarged view of position A;

[0025] Figure 3 The schematic diagram of the oil circuit connection of the present invention;

[0026] Figure 4 It is a top view of the large cover plate;

[0027] Reference numerals: 1-bearing seat;

[0028] 2-main shaft; 3-oil storage tank; 4-sealing structure; 5-injection hole; 6-oil storage chamber; 7-circulating oil pump; 8-main bearing; 11-rear shoulder; 12-oil level line; 13-radial sealing line; 31-oil drain hole; 61-oil return hole; 41-sealing ring; 42-large cover plate; 43-middle cover plate; 44-O-ring; 45-radial sealing ring; 46-felt sealing ring; 71-three-way valve; 72-lubricating oil tank. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0030] See also Figures 1 to 4 As shown in the first embodiment, the present invention provides a circulating oil lubrication system for the bearing of the main shaft 2 of a wind turbine generator set, comprising:

[0031] A bearing seat 1, used to support a main bearing 8;

[0032] A main bearing 8, used to support the rotation of the main shaft 2 of the wind turbine, the main bearing 8 is mounted on the bearing seat 1, and two main bearings 8 are provided;

[0033] The oil storage tank 3 is arranged in the installation cavity of the main bearing 8 on the bearing seat 1, and is used to keep the rollers of the main bearing 8 in an oil bath state; the height of the rear shoulder 11 of the bearing seat 1 is higher than the 1 / 2 position of the rollers of the main bearing 8 and lower than the highest point of the rollers. The main shaft 2 bearing lubrication system has an elevation angle. A horizontal line is drawn with the height of the rear shoulder 11 of the bearing seat 1 to form the oil storage tank 3. The lubricating oil sprayed from the upper oil spray port will flow into the oil storage tank 3 after lubricating the bearing. The highest oil level of the oil storage tank 3 is higher than the 1 / 2 position of the bearing rollers, which can ensure that the bearing rollers are in a good oil bath lubrication state during operation. The bottom of the oil storage tank 3 is provided with an oil drain hole 31, and a threaded plug or electromagnetic valve for sealing the oil drain hole 31 is detachably installed on the oil drain hole 31. An oil drain hole 31 is provided at the bottom of the oil storage tank 3 and is sealed with a magnetic threaded plug or an electromagnetic valve. Since the lubricating oil in the oil storage tank 3 cannot flow back by itself during normal operation, regular maintenance is required. It is replaced every six months in the first year of operation and then once a year. The operation and maintenance are very quick and convenient.

[0034] The sealing structure 4 comprises a sealing ring 41, a large cover plate 42 and a middle cover plate 43. The sealing ring 41 is sleeved on the main shaft 2, and one end face of the sealing ring 41 abuts against the end face of the main bearing 8. The large cover plate 42 is sleeved on the outer circumferential surface of the sealing ring 41, and one end face of the large cover plate 42 abuts against the bearing seat 1. The middle cover plate 43 is sleeved on the outer circumferential surface of the sealing ring 41, and one end face of the middle end cover abuts against the end face of the large end cover away from the main bearing 8. An O-ring 44 is arranged on the contact surface between the large cover plate 42 and the bearing seat 1, and a radial sealing ring 45 is arranged between the large cover plate 42 and the sealing ring 41. A felt sealing ring 46 is arranged between the middle cover plate 43 and the sealing ring 41; the entire sealing structure 4 is mainly divided into three layers, the outer layer is the felt sealing ring 46, which is mainly used to prevent external dust and other granular impurities from entering the sealing cavity; the inner layer is a radial sealing ring 45 with a certain pressure resistance, which is mainly used to prevent the splash leakage of the injection lubrication oil and the splash leakage of the oil stored in the oil storage tank 3 driven by the roller; the third layer of sealing is the O-ring seal between the large cover plate 42 and the bearing seat 1. Since the large cover plate 42 and the bearing seat 1 are in a relatively static state, it is mainly to prevent the lubricating oil in the oil storage tank 3 from leaking along the fitting surface under the action of long-term penetration.

[0035] The oil spray hole 5 is arranged on the large cover plate 42 and communicated with the oil storage tank 3. The oil spray hole 5 is provided in plurality. The oil spray hole 5 is provided to spray lubrication to the main bearing 8. The oil spray hole 5 is arranged on the upper half of the large cover plate 42, and the number of the oil spray holes 5 located in the first quadrant of the upper half of the large cover plate 42 is greater than the number of the oil spray holes 5 located in the second quadrant of the upper half of the large cover plate 42. In order to ensure the reliability of the lubrication of the main shaft 2 bearing, spray lubrication is arranged in the upper half of the bearing. Seven oil spray holes 5 are opened on the large cover plate 42 of the upper half of the bearing. Since the main shaft 2 component rotates clockwise when observed from the upwind direction, four oil spray holes are opened in the first quadrant and three oil spray holes are opened in the second quadrant. Each oil spray hole can ensure that the sprayed lubricating oil can be directly injected into the roller raceway to lubricate the bearing rollers.

[0036] The oil storage chamber 6 is arranged in the cavity between the two main bearings 8 on the bearing seat 1. The oil storage tanks 3 of the two main bearings 8 are connected through the oil storage chamber 6. The lowest point of the cavity of the oil storage chamber 6 is provided with an oil return hole 61. The oil return hole 61 is connected to the circulating oil pump 7 through the oil pipeline. The circulating oil pump 7 is connected to the oil injection hole 5 through the oil pipeline. A circulating oil pump 7 is provided to filter the refluxed oil and reuse it as the injection lubrication oil, thereby realizing oil circulation and reducing oil consumption.

[0037] Furthermore, the horizontal line at the highest point of the rear shoulder 11 of the bearing seat 1 forms the oil level line 12 of the oil storage tank 3, and the horizontal line at the lowest point of the sealing position of the radial seal ring 45 forms the radial sealing line 13, and the height of the oil level line 12 is lower than the radial sealing line 13. It is ensured that the excess lubricating oil flows over the shoulder of the bearing seat 1 into the middle oil storage cavity 6, and the oil line of the oil storage tank 3 is always located below the radial seal, thereby ensuring that the oil will not generate additional pressure on the radial seal during the stable service of the unit. While ensuring the sealing reliability, a radial seal with a lower pressure resistance level can be selected, thereby reducing costs and improving the competitiveness of the unit.

[0038] Furthermore, a filter is provided between the oil return hole 61 and the circulating oil pump 7. The filter is provided to filter the lubricating oil flowing out of the oil return hole 61 and then the filtered lubricating oil is sprayed toward the main bearing 8 of the pig through the circulating oil pump 7 and the oil spray hole 5.

[0039] Furthermore, the oil storage chamber 6 is provided with a sensor and a temperature regulating device for detecting the temperature and pressure in the oil storage chamber 6, and also includes a controller, which is connected to the sensor, the temperature regulating device and the circulating oil pump 7 by signal, and is used to receive the output temperature and pressure signal of the sensor and issue instructions to control the temperature regulating device and the circulating oil pump 7 according to the temperature and pressure signal. The sensor is set to monitor the temperature and pressure of the lubricating oil in the oil storage chamber 6 in real time, and the pressure and temperature signals are transmitted to the controller, and the controller controls the temperature regulating device and the conveying speed of the circulating oil pump 7 to control the temperature of the lubricating oil in the oil storage chamber 6, so that it can have a better lubrication effect.

[0040] Furthermore, a three-way valve 71 is provided on the oil pipe between the circulating oil pump 7 and the oil return hole 61. The two inlets of the three-way valve 71 are respectively connected to the oil return hole 61 and the lubricating oil tank 72 for storing lubricating oil, and the outlet is connected to the oil injection hole 5. A valve is provided on the inlet of the three-way valve 71. By providing the three-way valve 71, the oil inlet of the circulating oil pump 7 is respectively connected to the oil return hole 61 and the lubricating oil tank 72. At the beginning or when the lubricating oil is replaced, the valve of the oil return hole 61 is closed by opening the valve connected to the lubricating oil tank 72, and oil is added to the oil storage tank 3 and the oil storage chamber 6 through the circulating oil pump 7. After the lubricating oil is filled, the circulating oil pump 7 is closed, and then the valve connected to the lubricating oil tank 72 is closed and the valve connected to the oil return hole 61 is opened. The circulating oil pump 7 is continuously started so that the lubricating oil in the oil storage tank 3 and the oil storage chamber 6 can be circulated.

[0041] Embodiment 2 further comprises an oil filling pump, the inlet of the oil filling pump is communicated with the lubricating oil tank 72 for storing lubricating oil, the outlet of the oil filling pump is communicated with the oil injection hole 5, and valves are respectively arranged between the oil filling pump and the oil injection hole 5 and between the circulating oil pump 7 and the oil injection hole 5. The oil filling pump and the circulating oil pump 7 are respectively arranged, and after the main shaft 2 is installed, the oil filling pump is started to refuel the oil storage tank 3 and the oil storage cavity 6, and after refueling is completed, the oil filling pump is closed to complete the circulation of the lubricating oil through the circulating oil pump 7.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A circulating oil lubrication system for the main shaft bearing of a wind turbine generator set, characterized in that: include: A bearing seat (1) for supporting a main bearing (8); A main bearing (8) for supporting the rotation of the main shaft (2) of the wind turbine generator, the main bearing (8) being mounted on the bearing seat (1), and two main bearings (8) are provided; An oil storage tank (3), the oil storage tank (3) being arranged in a mounting cavity of the main bearing (8) on the bearing seat (1) and being used to keep the rollers of the main bearing (8) in an oil bath state; A sealing structure (4), the sealing structure (4) comprising a sealing ring (41), a large cover plate (42) and a middle cover plate (43), the sealing ring (41) being sleeved on the main shaft (2), one end face of the sealing ring (41) being in contact with the end face of the main bearing (8), the large cover plate (42) being sleeved on the outer circumferential surface of the sealing ring (41), one end face of the large cover plate (42) being in contact with the bearing seat (1), the middle cover plate (43) being sleeved on the outer circumferential surface of the sealing ring (41), one end face of the middle cover plate being in contact with the end face of the large cover plate away from the main bearing (8), an O-type sealing ring (44) being provided on the contact surface between the large cover plate (42) and the bearing seat (1), a radial sealing ring (45) being provided between the large cover plate (42) and the sealing ring (41), and a felt sealing ring (46) being provided between the middle cover plate (43) and the sealing ring (41); An oil spray hole (5), the oil spray hole (5) being arranged on the large cover plate (42) and communicating with the oil storage tank (3), and a plurality of the oil spray holes (5) being arranged; An oil storage chamber (6), the oil storage chamber (6) being arranged in a chamber between two main bearings (8) on the bearing seat (1), the oil storage grooves (3) of the two main bearings (8) being connected via the oil storage chamber (6), an oil return hole (61) being arranged at the lowest point of the chamber of the oil storage chamber (6), the oil return hole (61) being connected to a circulating oil pump (7) via an oil delivery pipeline, and the circulating oil pump (7) being connected to an oil injection hole (5) via an oil delivery pipeline; The height of the rear shoulder (11) of the bearing seat (1) is higher than the 1 / 2 position of the roller of the main bearing (8) and lower than the highest point of the roller; A filter is provided between the oil return hole (61) and the circulating oil pump (7).

2. The circulating oil lubrication system for the main shaft bearing of a wind turbine generator set according to claim 1, characterized in that: The horizontal line at the highest point of the rear shoulder (11) of the bearing seat (1) forms an oil level line (12) of the oil storage tank (3), and the horizontal line at the lowest point of the sealing position of the radial sealing ring (45) forms a radial sealing line (13). The height of the oil level line (12) is lower than the radial sealing line (13).

3. The circulating oil lubrication system for the main shaft bearing of a wind turbine generator set according to claim 1, characterized in that: The oil injection holes (5) are arranged in the upper half of the large cover plate (42), and the number of the oil injection holes (5) located in the first quadrant of the upper half of the large cover plate (42) is greater than the number of the oil injection holes (5) located in the second quadrant of the upper half of the large cover plate (42).

4. The circulating oil lubrication system for the main shaft bearing of a wind turbine generator set according to claim 1, characterized in that: An oil drain hole (31) is provided at the bottom of the oil storage tank (3), and a threaded plug or an electromagnetic valve for sealing the oil drain hole (31) is detachably mounted on the oil drain hole (31).

5. The circulating oil lubrication system for the main shaft bearing of a wind turbine generator set according to claim 4, characterized in that: The oil storage chamber (6) is provided with a sensor and a temperature regulating device for detecting the temperature and pressure in the oil storage chamber (6), and also includes a controller, the controller being connected to the sensor, the temperature regulating device and the circulating oil pump (7) by signals, the controller being used to receive output temperature and pressure signals from the sensor and to issue instructions to control the temperature regulating device and the circulating oil pump (7) according to the temperature and pressure signals.

6. The circulating oil lubrication system for the main shaft bearing of a wind turbine generator set according to any one of claims 1 to 5, characterized in that: A three-way valve (71) is provided on the oil pipe between the circulating oil pump (7) and the oil return hole (61); two inlets of the three-way valve (71) are respectively connected to the oil return hole (61) and a lubricating oil tank (72) for storing lubricating oil; the outlet of the circulating oil pump is connected to the oil injection hole (5); and a valve is provided on the inlet of the three-way valve (71).

7. The circulating oil lubrication system for the main shaft bearing of a wind turbine generator set according to any one of claims 1 to 5, characterized in that: It also includes an oil charging pump, the inlet of which is connected to a lubricating oil tank (72) for storing lubricating oil, the outlet of which is connected to an oil injection hole (5), and valves are respectively provided between the oil charging pump and the oil injection hole (5) and between the circulating oil pump (7) and the oil injection hole (5).

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